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Condensed Consolidated Statements of Comprehensive Loss (Unaudited) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Statement Of Income And Comprehensive Income [Abstract]
Net loss	$ (23,420)	$ (31,912)	$ (64,817)	$ (62,522)
Other comprehensive income (loss):
Foreign currency translation adjustments	958	(994)	431	(1,249)
Available-for-sale investments:
Unrealized gain on investments, net of tax effect	53	654	3	832
Reclassification from accumulated other comprehensive loss	0	(26)	0	(10)
Net change in unrealized gain on available-for-sale investments	53	628	3	822
Other comprehensive income (loss), net of taxes	1,011	(366)	434	(427)
Comprehensive loss	$ (22,409)	$ (32,278)	$ (64,383)	$ (62,949)

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Amount after tax of increase (decrease) in equity from transactions and other events and circumstances from net income and other comprehensive income, attributable to parent entity. Excludes changes in equity resulting from investments by owners and distributions to owners.

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The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

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Amount after tax and reclassification adjustments, of appreciation (loss) in value of unsold available-for-sale securities. Excludes amounts related to other than temporary impairment (OTTI) loss.

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Amount after tax and reclassification adjustments of gain (loss) on foreign currency translation adjustments, foreign currency transactions designated and effective as economic hedges of a net investment in a foreign entity and intra-entity foreign currency transactions that are of a long-term-investment nature.

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Amount after tax and reclassification adjustments of other comprehensive income (loss).

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Amount after tax, before reclassification adjustments, of unrealized holding gain (loss) on available-for-sale securities.

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